/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.io.gcp.pubsub;



import javax.annotation.Nullable;

import java.util.Map;



import static com.bff.gaia.unified.vendor.guava.com.google.common.base.Preconditions.checkNotNull;



/**

 * Class representing a Pub/Sub message. Each message contains a single message payload and a map of

 * attached attributes.

 */

public class PubsubMessage {



  private byte[] message;

  private Map<String, String> attributes;



  public PubsubMessage(byte[] payload, Map<String, String> attributes) {

    this.message = payload;

    this.attributes = attributes;

  }



  /** Returns the main PubSub message. */

  public byte[] getPayload() {

    return message;

  }



  /** Returns the given attribute value. If not such attribute exists, returns null. */

  @Nullable

  public String getAttribute(String attribute) {

    checkNotNull(attribute, "attribute");

    return attributes.get(attribute);

  }



  /** Returns the full map of attributes. This is an unmodifiable map. */

  public Map<String, String> getAttributeMap() {

    return attributes;

  }

}